This is an app search engine that will find anything! You don't even need a "keyword"...just type in what it is you want to do, and the engine will allow you to sort down to your own device. The list of results shows price, review rating, description, etc. I search for apps all the time, and this is a GREAT site.
If you're using Chrome or Firefox, this add-on will allow you to turn any web page into an ad-free PDF file.